@Wvm,
Nice video and your New Haven #2325 is a good-looking model. I hadn't seen one like that before.
The definitive reference I use for Boston & Maine steam locomotives is "Minuteman Steam" by Harry A. Frye (1982) - a difficult book to find nowadays. It shows that several B&M Atlantics lasted into 1947 and the last one until 1949. It also has a picture of B&M 4-4-2 #3242 pulling wood-sided commuter coaches (like your models) dated August 1947. But it doesn't list or show any Atlantics into the 1950s. Lionel recently offered a model of B&M Atlantic #3243 that is still available new from Forum Sponsor Charles Ro. #3243 was scrapped in 1941.
B&M 2-8-0 Consolidations did remain in service into the 1950s. In particular, B&M #2403 was the last one on the railroad and remained in commuter service into the 1950s. It was scrapped in 1955 and would be a good match for your wood-sided passenger cars. Weaver made a model of #2403 (see photo).
B&M 2-6-0 Moguls also ran into the 1950s and typically pulled wood-sided passenger coaches like your models. The B&M sold its last Mogul in 1956. Lionel has made accurate models of B&M 2-6-0s in versions with TMCC and Legacy.
MELGAR
